Transcript for Royal Trekking Triumph: Prince Harry's Brave Journey to South Pole

prince harry's trekking triumph. Braving the frigid tundra, all in the name of charity. Celebrating the accomplishment of his expedition where temperatures dipped way below zero. Abc's bob woodruff, who interviewed harry on his trek to the north pole, has all the details. Reporter: More than 200 miles, temperatures below zero. 12 wounded veterans made their way to the south pole, along with prince harry, the military pilot who has served twice in afghanistan. We all had hopes. And all in all, mission success. Reporter: Also on this voyage, the true blood star, alexander scar guard. It's been very, very tough. We have everything from a mind guy to a double-amputee on the team. And everyone made it. Reporter: I did have the opportunity to travel with prince harry on his previous arctic trip to the north pole. Is it okay if I call you prince harry? Can I call you bob? Reporter: Yeah. It was for the same organization, walking with the wounded, a charity that provides rehabilitation services for wounded veterans. It's a great charity. They're doing fantastic work in trying to help soldiers that have been wounded overseas to come back home. Reporter: The trip was supposed to be a race to the pole. Between the americans and the brits. But because of weather and stress, they canceled the competition, traveling together, instead. Everyone's feeling a bit tired. But have to get used to the rhythm. Reporter: Now, in rhythm, they are heading home. For "good morning america," I'm bob woodruff, abc news, new york.

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